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SubjectRe: [PATCH v2 2/2] firmware: coreboot: Collapse platform drivers into bus core
Hi Stephen,

I love your patch! Perhaps something to improve:

[auto build test WARNING on linus/master]
[also build test WARNING on v4.18-rc8 next-20180809]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url: https://github.com/0day-ci/linux/commits/Stephen-Boyd/firmware-coreboot-Fix-probe-and-simplify-code/20180810-015624
reproduce:
# apt-get install sparse
make ARCH=x86_64 allmodconfig
make C=1 CF=-D__CHECK_ENDIAN__


sparse warnings: (new ones prefixed by >>)

drivers/firmware/google/coreboot_table.c:113:22: sparse: cast removes address space of expression
drivers/firmware/google/coreboot_table.c:115:39: sparse: incorrect type in argument 2 (different address spaces) @@ expected void const volatile [noderef] <asn:2>*addr @@ got noderef] <asn:2>*addr @@
drivers/firmware/google/coreboot_table.c:115:39: expected void const volatile [noderef] <asn:2>*addr
drivers/firmware/google/coreboot_table.c:115:39: got void *[assigned] ptr_entry
drivers/firmware/google/coreboot_table.c:127:47: sparse: incorrect type in argument 2 (different address spaces) @@ expected void const volatile [noderef] <asn:2>*addr @@ got noderef] <asn:2>*addr @@
drivers/firmware/google/coreboot_table.c:127:47: expected void const volatile [noderef] <asn:2>*addr
drivers/firmware/google/coreboot_table.c:127:47: got void *[assigned] ptr_entry
>> drivers/firmware/google/coreboot_table.c:163:29: sparse: dereference of noderef expression
drivers/firmware/google/coreboot_table.c:163:52: sparse: dereference of noderef expression

vim +163 drivers/firmware/google/coreboot_table.c

96
97 static int coreboot_table_init(struct device *dev, void __iomem *ptr)
98 {
99 int i, ret;
100 void *ptr_entry;
101 struct coreboot_device *device;
102 struct coreboot_table_entry entry;
103 struct coreboot_table_header header;
104
105 ptr_header = ptr;
106 memcpy_fromio(&header, ptr_header, sizeof(header));
107
108 if (strncmp(header.signature, "LBIO", sizeof(header.signature))) {
109 pr_warn("coreboot_table: coreboot table missing or corrupt!\n");
110 return -ENODEV;
111 }
112
> 113 ptr_entry = (void *)ptr_header + header.header_bytes;
114 for (i = 0; i < header.table_entries; i++) {
115 memcpy_fromio(&entry, ptr_entry, sizeof(entry));
116
117 device = kzalloc(sizeof(struct device) + entry.size, GFP_KERNEL);
118 if (!device) {
119 ret = -ENOMEM;
120 break;
121 }
122
123 dev_set_name(&device->dev, "coreboot%d", i);
124 device->dev.parent = dev;
125 device->dev.bus = &coreboot_bus_type;
126 device->dev.release = coreboot_device_release;
127 memcpy_fromio(&device->entry, ptr_entry, entry.size);
128
129 ret = device_register(&device->dev);
130 if (ret) {
131 put_device(&device->dev);
132 break;
133 }
134
135 ptr_entry += entry.size;
136 }
137
138 return ret;
139 }
140
141 static int coreboot_table_probe(struct platform_device *pdev)
142 {
143 phys_addr_t phyaddr;
144 resource_size_t len;
145 struct coreboot_table_header __iomem *header = NULL;
146 struct resource *res;
147 void __iomem *ptr = NULL;
148
149 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
150 if (!res)
151 return -EINVAL;
152
153 len = resource_size(res);
154 if (!res->start || !len)
155 return -EINVAL;
156
157 phyaddr = res->start;
158 header = ioremap_cache(phyaddr, sizeof(*header));
159 if (header == NULL)
160 return -ENOMEM;
161
162 ptr = ioremap_cache(phyaddr,
> 163 header->header_bytes + header->table_bytes);
164 iounmap(header);
165 if (!ptr)
166 return -ENOMEM;
167
168 return coreboot_table_init(&pdev->dev, ptr);
169 }
170

---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all Intel Corporation

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